Oscillator mounting



Filed ot. 17, 1929 /M/E/VTOR 1 FOMLM//ia/r/s /7 aa 5X W" Fl? a, M

Arran/VE Patented 10, 1936 Piillzri'r OFFICE oscILLA'roR MOUNTING- Robert Longfellow Williams, Newton, Mass., as-

signor to Submarine Signal Company, Boston, Mass., a, corporation of Maine Applicationoctober 17, 1929, Serial No. 400,256

5 claims. (c1. 177-386) The present invention relates Ato submarine .signaling apparatus,` and more particularly to themeans and method` of mounting such apparatus on a vessel, especially where'sending and receiving apparatus may be employed simul7 taneously.

In `the presentinvention, the`apparatus is so mounted on the vessel and associated therewith that it may be used for determining depths asv Well as for general signaling.

In the prior art, the apparatus mounted upon the vessel could be used only forv general sig-v naling and not for both general signaling and for depth sounding, or for general signaling an directive reception.

Whewn oscillators are installed on the side of the vessel, there is a tendency for the vessel to screen the sound from proceeding in certain directions, and likewise with receivers there is a tendency for the ship to interfere with the re-` ception of sound coming from certain directions with reference to the boat. If the oscillators are tically impossible to receive sound with any re liability other than' sound reflected from the sea bottom.

At present it is becoming essential to provide means which will function not only for general signaling and reception but also 4for signaling directively and'for depth sounding purposes.

In the system. of the present application, I provide sound receiving and sending apparatus mounted in the bilge keel.

In my Patent 1,677,945, there is shown an elongated oscillator mounted on thefbilge keel, but such an installation, while suitable in many'ways and for many things, is not able to put out as much power or so much power uniformly distributed as the system disclosed in the present invention. Whereas the oscillator in the Patent 1,677,945 also has'a particular directive quality, the oscillator used in the present invention has practically a uniform radiation in all directions, vand the directive featureis obtained by a combination' oi.V oscillators mounted in the bilge keel. Then again, while the oscillator is notl directive, it can be used for soundings as well as for general signaling, and by the use of a number 'in conlearned .from the description given below in con-h nectionwith the figures of the drawing, in which: `Figure 1 shows the position of a plurality'of sound receiving or sending devices upon the vessel; 5

Figure 2 shows the mounting of an individual sender or receiver;

Figure 3 shows the details of mounting;

Figure 4 shows'the circuit employ :d in the system; and Figure 5 shows an enlarged view of Figure 3 showing the oscillator in section.

In Figure 1, I represents a vessel provided with a -bilge keel 2, in which are mounted receiving and sending devices 4, 5 and 6. These may be 15 mounted on both sides of the vessel as shown in Figure 4. The elements-4, 5 and 6 maybe oscillators capable of use for both sending and receiving,'and are so shown in Figure 4. l

Figure 2 shows a single oscillator 'I so mounted. 20 In Figure 1, the phase of the oscillators may be so controlled that a directive beam may A be emitted by having each oscillator runl by a sep# arate generator driven on one and the same shaft and adapted to be shifted in position with respect 25 v to each other.

In Figure 3 is shown the method of installing the device inthe bilge keel. Theoscillator B is a double diaphragm device having diaphragms 9 and I Il on opposite halves thereof. The oscil- 30 lator used is of the ilat type and is provided on one side with a ange I I. The bilge keel 2l is provided with an inner -plate I3, which is held fast to the boat by the angles I4 and I5 riveted thereto on either side thereof. A hole is cut in the plate I3 the size of the smaller end of the oscillator and the oscillator is set therein. A ring I6 on the anged side of the oscillator, and another ring I1 on the opposite side, 'are used to provide a streamline body.` The oscillator is held fast to the plate by bolts I2 which pass through the oscillator'ange and screw into the ring I1. The boss or ring I6. is held byrivets or bolts or is welded to the plate I3. The angle I4 is cut at' 30 to allow the cable 3| from the, oscillator to 45 pass through to the interior-of the boat through the cable head 32, which is watertight.

In prior methods of mounting, only oneface of the oscillator has been exposed. Employing such y a method in using the bilge keel would mean that the sound could not be efliciently radiated in all directions. In fact, if radiation was from the bottom side, there would be a directive tendency downward and from the top side there would be a slight screening downward. By radiating from throughout a sphere with the oscillator as a center is obtained.

In Figure 4 is shown the circuit which I prefer to use in the present system, the. oscillators 2@ and 2l, mounted in the bilge keel, may be operated as senders by throwing the switches 22 and 23 to the left in the figure. Both oscillators are then connected to the generator E through the key 25. By throwing the switches 22 and '23 to the right, the. oscillators are connected for receiving to the amplifier 26 and the indicator or telephone 2l. The battery 28 furnishes fa polarizing current, if necessary. Both switches may be thrown in the same direction-'or one may be thrown to the right and the other to the left.

When employing the system for simultaneous receiving and sending, the oscillator, while radiating substantially in a sphere, as explained above, nevertheless is shielded when used as a' receiver from direct reception of the sound from the other oscillator-on the opposite 4bilg'e keel, because o the boat andthe proximity of the receiver and sender. This shielding zone-does not extend far from the boat, vand in fact does lnot seriously prevent sending equally 'efficiently in all directions.

When used for receiving, either unit may 'be used alone or both together. In fact, 'hyzproviding proper indicating means the receivers Eil and 2i could be used as a base for determining the direction of a source of sound.

Having now described my invention, 1' claim:

1. In combination, an oscillator having two sound producing diaphragms in opposite sides thereof and a boat having a bilge keel, said'bilge keel being provided with a hole 'adapted to receive said oscillator, said oscillator `having a ange on one side resting on said keel and means for bolting said oscillator ange 'to .said keel.

2. In combination vwithl a ibilge keel, having a hole therein, a sound signaling means having `opposed diaphragm, a flange provided on orne diaphragm, a ring fitting around the opposite 2,038,165 top and bottom, practically a uniform radiation diaphragm, means for holding fast said ange and ring with said bilge keel, and a. second ring provided about said .flange the outer edges of said rings being curved to provide a, stream line body with said hilge keel.

3. In combination with a vessel having 'a bilge keel with a hole cut therein, an oscillator of sub stantially the same shape and size as said hole and the same thickness as the keel, said oscillator having two opposed parallel diaphragms and ange extending outwardly from one diaphragm 'forming a shoulder for supporting the oscillator 'to the keel, means securing said flange to said keel, and means positioned about the periphery of both diaphragms and secured to said keel forming a stream-line effect with the keel.

4. In combination with a vessel having a bilge keel with a hole cut therein, an oscillator of substantially the same shape and size as said hole 'and the same thickness as the keel, said oscillator having two opposed parallel diaphragm and ange extending outwardly from one dia phragm forming a shoulder for supporting the oscillator to the keel, means securing said ilange to saidl keel, means vforming a ring Aabout the oscillator positioned at the edge of each diaphragm and forming a stream-line surface with the .keel 'and means supporting said ring to said keel.

5. In combination with a vessel havinga bilge i keel with a hole cut therein, an oscillator -of substantially the same shape and size as said hole and the same thickness as the keel, said oscillator.

mkeel, Y-mleans positioned'about theY 'periphery of both diaphragms and secured to said keel forminga. stream-line eiect with the keel, and means electrically connecting said oscillator from the inside of the vessel, including a cable and means ,retaining said cable to the surface of said keel.

ROBERT LONGFEILOW WILLIAMS. 

